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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb7c8fd767f4799883a30773f27b147fd7102071f46a2df5f832ae4c5acdff9' 
  AND token = '/f3e9OUcwP9ZHQdlkG48Ky58y7rcm4b0gLY8FtrMmgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}